Dew PointThe temperature at which water vapour will condense as warm, moist air is cooled.

Double Hung WindowAn operating style of window with an upper sash that slides down, and a lower sash that slides up.

Drip Cap or FlashingA molding placed on the top of the brickmould or casing of a window frame.

Dry GlazingA method of securing glass in a window frame with a dry, resilient gasket, without the use of a glazing component.

Dual PaneAn insulated glass unit consisting of two panes of glass held together by a sealant and a spacer bar.

Edge of GlassThe area within 10cm (2.5”) of the edge surrounding the perimeter of the glass.

EgressThe space in which the operating part of the window requires clearance for fire regulations.

Elliptical WindowCurved top half window that does not form a half circle since the curvature is less. Nor does the arch come down to the sill, but meets with vertical sides.

EmissivityThe rate at which a surface of a material radiates long-wave heat energy, usually referring to glass surface properties. Low emissivity results in less overall heat loss.

Extended Half Round and Elliptical WindowThe sides extend to various heights beyond the curvature of the top.

Extension JambsFlat wood or PVC parts that are applied to the inside of the frame to extend it in width, which allows the frame to adapt to a thicker wall. (6 ½” or other special widths).

Exterior GlazedGlass installed from the exterior side of the window.

Finseal WeatherstrippingA brush type weatherstripping that has a plastic mylar fin centred in the pile. Mainly used with sliders.

Fixed UnitA stationary window or door unit that does not open.

FlashingA thin strip of metal or synthetic material that diverts water away from a window or skylight.

Flushbolts and AstragalWhere a double door is desired that will have no restricting post when both doors are open. This movable, weather-stripped post is attached to one door and locked to the head and sill with flush bolts.

FrameThe enclosing box of a window or door that surrounds a sash or sealed unit, consisting of a head, sill and two jambs.

French DoorHinged door available in one, two, three, or four-wide combinations with up to two panels operating.

Fusion Welded Corners (PVC)Equal to the extruded frame. 100% air and water tight. All frames and sash are constructed in this fashion in automated machines to produce a perfectly square frame every time.

Garden DoorAvailable two or three-wide, one panel operates as a door while the other panel opens window-style and comes complete with screen. On three-wide units the third panel is fixed.

Glazing (1)The generic term for the transparent, or sometimes translucent, material in a window or a door. It is most often glass.

Glazing StopUsed to hold the glass into the frame.

Glazing/Glazed (2)Is the process of installing a sealed unit into a frame or sash using stops. Also refers to the type of glass used to make the sealed unit.

GliderAn operating style of window that has a sash which slides horizontally to open.

Grilles (Muntin bars)Dividing bars or muntins, used either on the surface or between panes of glass for a decorative appearance.

Half Round WindowTrue half round where the arch comes right down to the sill. The height is half the width.

HeadThe top portion of a window or door frame.

Head and SeatAttached to the top and bottom of a Bay or Bow window as an option where the wall is NOT framed to follow the angle of the window.

HopperA window unit in which the top of the sash swings inward.

Inside CasingAvailable for half rounds or other curved top windows in laminated pine or oak.

Insulated Glass Unit (IG or IGU)A combination of two or more panes of glass factory sealed using a spacer bar. Also known as a sealed unit.

Integral Nailing FinA prepunched fin that is part of the extrusion which allows for easy installation.

Interior GlazedGlass installed from the interior of the building.

Interlocking Mullion and SashWhere the sash joins the centre of the fixed mullion the two are drawn together by a beveled interlock that is double weather-stripped.

JambThe side components of a window or door frame.

Jamb Wrap (Painted Metal)Applied on the jamb between the brickmould and weatherstrip of a door frame.

Tri-paneA sealed unit consisting of three panes of glass separated with two spacer bars.

U-ValueA measurement of heat transmission (see R-Value.)

Visible Light TransmittanceThe percentage of visible light that is transmitted through a glazing combination. The type of sealed unit, coatings and tints will affect the percentage of visible light transmittance.

WeatherstrippingA material used to create an air or water seal between operating components of a window or door.

Wind LoadThe amount of pressure exerted by the wind on a window or door generally expressed in pounds per square foot.

While we endeavor to ensure our information is accurate, All Weather Windows will not be held liable for any inaccuracies. All information on this website is subject to change, errors and omissions without notice or liability. Please note all colours are not exactly as shown due to technical limitations and monitor differences.